Derrick



(No Model.)

J. MOMYLER.

Derrick.

No 234,313. Patented Nov. 9,1880.

UNITED- STATES PATENT ()FFICE.

JOHN MOMYLER, OF CLEVELAND, OHIO.

DERRICK.

SPECIFICATION forming part of Letters Patent No. 234,313, dated November9, 1880. Application filed April 26, 1880. (No model.)

To all whom it may concern Be it known that I, JOHN MOMYLER, ofCleveland, in the county of Ouyahoga and State of Ohio, have inventedcertain new and useful Improvements in Derricks; and I do hereby declarethe following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itpertains to make and use it, reference being had to the accompanyingdrawing, which forms part of this specification.

My invention relates to cranes and derricks and it consists in certaindetails in construction and combination of parts, as will hereinafter bedescribed, and pointed out in the claims.

The drawing represents an isometric view of a device constructedaccording to my invention.

In the said drawing, A is the bed or foundation upon which the turningtable B rests and revolves about its pivotal point B B are casters oranti-friction rollers, of any suitable kind, interposed between the bedA and table B. O 0 represent the upper frame-work -of the device. Thisframe-work is in any effective manner rigidly united and bound at thetop, and at the bottom is securely fixed to the revolving table B.

D is the boom, adjustably located or pivoted at its foot to the table Bin such a manner as that it is permitted to have an up-and-down movementto any sufficient degree. The boom D may be constructed either of asingle solid spar or any suitable frame-work. Upon its outer end isjournaled a pulley, D.

E is a pulley journaled in a carriage, E, running upon its wheels Ealong the upper surface of the boom D. As the carriage E is drawn up ordown the boom the lifting hook or clamp F and its pulley F will beshifted farther from or nearer to the table B, and in this featureresides an important characteristic of my invention.

In order to govern the lifting hook or clamp F, I provide two sets ofropes and pulleys, one for shifting the position of the carriage E asmay be necessary and the other for lifting and'lowerin g the hook orclamp F.

G represents the rope or cable for shifting the carriage E. Tracingitfrom the carriage E, to which it is attached at the outer end, it passesover the pulley D, from thence to the pulley D journaled between theframes 0, and from thence down to a drum or bull-wheel. (Not shown, butwhich may be actuated by any suitable mechanism.)

H is the lifting-rope. It is also attached to the carriage E, andtracing it from thence, it will be seen to pass over the pulley E, thenover the pulley Efljournaled in the frame-work O, and from thence to asuitable drum or bullwheel. (Not shown.)

K is the boom-cable, through which the boom is raised or lowered.Tracing the cable K from any suitable drum or bull-wheel located uponthe table B, it will be seen to pass up to the compound pulley K; fromthence down to the pulley K attached to the boom near its middle portionfrom thence up again to the pulley K; thence down to a pulley, K fixedupon the boom adjusted to the pulley K from thence up again to thepulley K; thence forward to the pulley K, fixed to the outer end of theboom; from thence to the top of the derrick or frame-work O 0, where itis securely anchored. By this pulley arrangement it will be seen thatthe derrick is lifted from two points by the rope K.

The operation of my device is as follows: The boom D is adjusted nearerto or farther from the pivot-point B in order to throw the center ofgravity approximately to the suitable place, according to the work to bedone. The cable K is taken in or paid out until the boom is at itsproper incline. The carriage E is shifted through the agency of the ropeGr until the lifting hook or clamp F is over the weight to be raised, orover the place where the weight is to be deposlted, and the cable H isdrawn in or paid out, according as the weight is to be lifted orlowered.

In lifting a weight from one place to deposit it in another the entirederrick may, if necessary, be turned upon its axis B.

I do not limit myself in any degree to the exact construction of any ofthe particular elements herein described, as they may be mechanicallyconstructed to suit the special purposes for which they may be designed.For

instance, the carriage E might be made to move in a groove or guideinstead of upon its trundle-wheels E The cables G, H, and K may beoperated either by hand or, as already intimated, by drums orbull-wheels actuated by suitable application of power, and this powermay be that exerted by a steam-engine, which may be in any mannersuitably located upon the revolving table B.

What I claim is- 1. In a lifting crane or derrick, the combination, witha revolving table, of a boom adjustably secured at its lowerend to saidtable, whereby it may be secured at any desired distance from thepivotal center of said table, substantially as set forth.

2. In a lifting crane or derrick, the combination, with a revolvingtable and derrick mounted thereon, of a boom supported at its as lowerend by journals located in adjustable bearings, substantially as setforth.

3. In a lifting crane or derrick, the combination, with a revolvingderrick, of a boom anchored at its lower end to arevolving table, asliding pulley and lifting-hook, and means for moving said pulley andlifting-hook toward or from the end of the boom, and independent ropesand pulleys for raising and lowering the boom, substantially as setforth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOHN MCMYLER.

Witnesses:

.lNo. UROWELL, J r., W. E. DONNELLY.

